Manufacture of chamotte bricks



Patented Nov. 17, 1925.

SVEN EMIL SIEURIN, OF HOGANAS, SWEDEN.

M'ANUFACTURE 0F CHAMOTTE BRICKS.

No Drawing. Application filed July 27,

To ((ZZ whom 21; may concern.

Be it known that I, SvnN EMLL SlEUniN, subject of the King of Sweden, residing at Hoganas, Sweden, have invented certain new and useful Improvements in the Manufacture of Chamotte Bricks, of which the following is a specification.

Chamotte bricks are, as well known, the most common of the fire proof bricks; at a high ten'lperature they are, however, very sensitive to load, for which reason they can not be used in such cases where a great load and a high temperature are required simultaneously. In such cases bricks of silica heretofore commonly have been used, but that material, however, from other points of view and especially regarding its capacity of resisting changes in the temperature is very inferior to the chamotte bricks.

It is already known that by an increase of the percentage of silica in fire proof material the so called cone melting point of said material decreases until the said percentage reaches about 90% but that it thereafter rises by a further increase of the percentage of silica. The resisting power of the brick against load at a high temperature, which power could be indicated as the practical incumbustibleness of the material, however, is not subject to variation similar to the cone melting point, the minimum resisting power is situated at a percentage of silica between and SiU Already at a percentage of about 7 3% Si0 the resisting power against pressure at a high temperature is as great as that of a chamotte material with the greatest percentage of clay (corresponding to about 55% SiO Following these observations the appli- Serial No. 654,257.

cant has succeeded to produce chainotte bricks with an power against than that hitherto essentiall greater resisting load at a high temperature known in the practice.

ture of in such finely powdered silica and fire clay proportions that the percentage of silica in the mixture in a sample after heating to glowing preferably, however,

and thereafter bined masses in heat amounts to 73%-90%, between and to form and burn the comthe usual manner.

It is of course also possible to produce the binding mass from a clay in its natural condition containing the quantity of silica required; hereby grind the clay becomes very it is, however, important to very Well, so that the silica completely distributed therein.

Having now particularly described the nature of my i its operation,

of the bricks,

nvention and the manner of what I claim is: In a process for chamotte bricks,

the manufacture of adding to the main mass a binding mass consisting of an intlmate mlxture and fire clay, the said of finely divided silica mixture being such that a sample of it after heating to glowing heat contains 73-90% mass of chamotte and sisting of an silica, and then burning the bricks, comprising a main a binding mass conmtlmate mixture of finely divided silica and fire clay, a red hot sample of which mass contains 7390% silica.

In testimony whereof I aflix my signature.

SVEN EMIL SIEURIN. 

